21054273 has 16 divisors (see below), whose sum is σ = 28563840. Its totient is φ = 13793024.

The previous prime is 21054263. The next prime is 21054277. The reversal of 21054273 is 37245012.

It is a cyclic number.

It is not a de Polignac number, because 21054273 - 2⁸ = 21054017 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21054277) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58468 + ... + 58826.

It is an arithmetic number, because the mean of its divisors is an integer number (1785240).

Almost surely, 2^21054273 is an apocalyptic number.

It is an amenable number.

21054273 is a deficient number, since it is larger than the sum of its proper divisors (7509567).

21054273 is a wasteful number, since it uses less digits than its factorization.

21054273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 21054273 is about 4588.4935436372. The cubic root of 21054273 is about 276.1298879294.

Adding to 21054273 its reverse (37245012), we get a palindrome (58299285).

The spelling of 21054273 in words is "twenty-one million, fifty-four thousand, two hundred seventy-three".